First heavy ion beam tests with a superconducting multigap CH cavity
First heavy ion beam tests with a superconducting multigap CH cavity
复制标题
DOI：
10.1103/physrevaccelbeams.21.020102
复制
发表时间：
2018-02-27
影响因子：
1.7
通讯作者：
Yaramyshev, S.
中科院分区：
文献类型：
--
作者：
Barth, W.;Aulenbacher, K.;Yaramyshev, S.
在连续波重离子束流的中低能量超导加速器中，需要非常紧凑的加速聚焦结构、短聚焦周期、高加速梯度和短漂移空间。为了保持GSI-超重元素（SHE）项目在高水平甚至更高水平上的竞争力，一个独立的sc - cw直线加速器（亥姆霍兹直线加速器）与GSI高电荷态注入器（HLI）相结合，升级为cw操作，被设想。最近，第一个直线部分（由Helmholtz Institute Mainz （HIM）和GSI资助）作为217 MHz多间隙横杆h模结构（CH）能力的演示已经投入使用，并在HLI的重离子束下进行了广泛的测试。验证装置使重离子加速达到设计束流能量。在高束流强度和全束流传输条件下，重离子束达到了所需的加速增益，甚至超过了设计质量与电荷比。本文介绍了CH腔中不同射频振幅和相位的系统束流测量，以及不同质荷比重离子束流的相空间测量。世界上第一次成功的超导多隙CH腔束测试是HIM和GSI与IAP合作的研发工作的一个里程碑，为HELIAC项目和其他铯离子束应用做准备。
Very compact accelerating-focusing structures, as well as short focusing periods, high accelerating gradients and short drift spaces are strongly required for superconducting (sc) accelerator sections operating at low and medium energies for continuous wave (cw) heavy ion beams. To keep the GSI-super heavy element (SHE) program competitive on a high level and even beyond, a standalone sc cw linac (Helmholtz linear accelerator) in combination with the GSI high charge state injector (HLI), upgraded for cw operation, is envisaged. Recently the first linac section (financed by Helmholtz Institute Mainz (HIM) and GSI) as a demonstration of the capability of 217 MHz multigap crossbar H-mode structures (CH) has been commissioned and extensively tested with heavy ion beam from the HLI. The demonstrator setup reached acceleration of heavy ions up to the design beam energy. The required acceleration gain was achieved with heavy ion beams even above the design mass to charge ratio at high beam intensity and full beam transmission. This paper presents systematic beam measurements with varying rf amplitudes and phases of the CH cavity, as well as phase space measurements for heavy ion beams with different mass to charge ratio. The worldwide first and successful beam test with a superconducting multigap CH cavity is a milestone of the R&D work of HIM and GSI in collaboration with IAP in preparation of the HELIAC project and other cw-ion beam applications.